‘Comey better hope there are no tapes of our conversations’ before leaking to press – Trump
Comey, who had been leading an investigation into alleged collusion between Trump's advisers and Russian officials, was abruptly fired by the president on Tuesday.
The former FBI director has said that he is "not worried about any tapes" that Trump may have of their dinner conversation, according to CNN.
The White House refused to comment on the president's tweet, but said it was "not a threat."
When asked about a former FBI official who said that the implied threat in Trump's tweet shows that the president is "simply out of control," White House press secretary Sean Spicer replied: "That's frankly offensive."
In a separate tweet, Trump questioned when the “witch hunt” would end, noting that former National Intelligence Director James Clapper and “virtually everyone else” with knowledge of the situation says there has been no collusion with Russia.
Trump admitted during a Thursday interview with NBC's Lester Holt that "this Russia thing" was on his mind when he made the decision to sack Comey, who he referred to as a "showboat."
However, he said the main reason for firing him was because the FBI has been "in turmoil."
"You take a look at the FBI a year ago, it was in virtual turmoil, less than a year ago. It hasn't recovered from that," Trump said.
Trump has repeatedly denied that he or anyone on his staff has ties to Russia, tweeting earlier on Friday that the story was "fabricated by Democrats as an excuse for losing the election."
Trump has vowed that Comey will be replaced by "someone who will do a far better job," noting that he had "lost the confidence of almost everyone in Washington."